jobo
Grandmaster
its not a case of memory its making them instinctive bt constantly repeating them. That how we learn instinctive movement. That's how we learn to walk, then run, they play soccer pr what ever.Do you train BJJ?
I don't, but I'm pretty sure a big part of the system isn't simply physically memorizing movements. Some Karate (gulp, I train karate), Kung Fu, TKD, etc. places do this; demonstrate a kata proficiently, then you're promoted without ever understanding what the movements mean nor how to actually use them, let alone against a resisting partner/opponent. For the most part, BJJ don't play that.
And having a career, spouse, kids, etc. have a funny way of getting in the way. I can only make it to the dojo 2 nights a week. And it's a miracle that I can. During my first stint, I didn't have that.
bjj is exactly that, programed movement, you oppoinent does this, you do that in response